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AzTrials

Bacterial InfectionPhase 1NCT05645757

Safety Study of Intravenous Ertapenem in Combination With Zidebactam (WCK 6777)

A Phase 1 study testing Ertapenem, WCK 6777 and Zidebactam in people with Bacterial Infection, run by National Institute of Allergy and Infectious Diseases (NIAID) at 1 site in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

This is a Phase 1, single center study to investigate the safety, tolerability, and pharmacokinetics (PK) of three dose-level groups of WCK 6777 (ERT and ZID combination), and two dose-level groups of ERT alone and ZID (WCK 5107) alone in 52 healthy adult male and female subjects aged 18 to 45 years old (both… Read more about this study

Who is it for?
Ages 18 to 45 yearsHealthy volunteers can take part
Conditions the study is for
Bacterial Infection
What is being tested?
Ertapenem, WCK 6777 and Zidebactam
Type of treatment
Injection or infusion
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
54 participants
Where
1 siteUnited States
Study dates
19 Apr 2023to 3 Nov 2023
Phase
Phase 1
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 45 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Provide a signed and dated written informed consent and agrees to comply with the study procedures and length of confinement to the research site.
  • Be able to understand and willing to comply with study procedures, restrictions, and requirements, as determined by the Site Principal Investigator (PI) or authorized clinician(s) (listed on FDA Form 1572).
  • Adults 18 to 45 years of age inclusive, including non-pregnant, non-lactating females.
  • Have suitable veins for cannulation or repeated venipuncture.
  • Be in good general health at the time of enrollment. Note 1: Determined by medical history (MH), medication use, physical examination (PE), vital signs (VS), clinical laboratory tests including estimated creatinine clearance (CLCR) > / = 80 mL/min by the Cockcroft-Gault method, and 12-lead Electrocardiogram (ECG) within reference ranges at Screening and Day-1.
  • Note 2: Exceptions to Blood Pressure (BP), Heart Rate (HR) and laboratory test values being with normal ranges are:
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  • Subjects with baseline HR > / = 45 to 50 Beats per Minute (bpm) may be accepted if otherwise healthy adults with known history of asymptomatic bradycardia.
  • Subjects with baseline Systolic Blood Pressure (SBP) up to 140 Millimeters of Mercury (mmHg) and Diastolic Blood Pressure (DBP) up to 90 mmHg may be accepted if otherwise healthy.
  • A laboratory value that is Grade 1 will be allowed if not considered to be clinically significant by the investigator, with the exception of Alanine Aminotransferase (ALT), Aspartate Aminotransferase (AST), Alkaline Phosphatase (AP), total and direct bilirubin, Blood Urea Nitrogen (BUN), serum creatinine, Creatinine Clearance (CLcr), and urine protein.
  • Sexually active females must be of non-childbearing potential or must use a highly effective method of birth control from screening to 30 days following the last dose of study product.
  • Note 1: A female is considered of childbearing potential unless post-menopausal (defined as history of > / = 1 year of spontaneous amenorrhea and a Follicle-Stimulating Hormone (FSH) level >40 IU/L), or permanently surgically sterilized.
  • Note 2: Highly effective contraceptive methods include: (a) surgical sterilization methods, such as tubal ligation, bilateral oophorectomy, salpingectomy, hysterectomy, or successful tubal obliteration (e.g., Essure(R)) with documented radiological confirmation test at least 90 days after the procedure, or (b) long-acting reversible contraception, such as progestin-releasing subdermal implants, copper intrauterine devices (IUDs), levonorgestrel-releasing IUDs.
  • Note 3: A subject who is not sexually active and abstains from sexual intercourse can be enrolled and abstinence documented.
  • Sexually active males must be vasectomized or agree to use barrier contraception and not donate sperm from first dose of study product until 30 days following the last dose.
  • Note 1: Barrier contraception includes use of condom with spermicide. Note 2: A subject who is not sexually active and abstains from sexual intercourse can be enrolled and abstinence documented.
  • Subjects must be willing to avoid excessive physical exercise within 48 h prior to dosing until discharge from the CTU on Day 8, and 24 h before the last visit (Day 11 +3 days).
  • No history of acute febrile or infectious illness for at least 7 days prior to the administration of study drug(s).

Who cannot join

  • Known history of a clinically significant food or drug allergy/hypersensitivity including known allergy/hypersensitivity to Ertapenem (ERT), any ß-lactam drugs or other related drugs.
  • Current seasonal allergies with ongoing symptoms for more than a week prior to dosing requiring glucocorticoids and/or frequent use of antihistamines for treatment.
  • Any history of a chronic condition including renal failure that may increase risk to subject or interfere with endpoint assessment, or any unstable chronic disease.
  • Note 1: Unstable chronic disease is defined by need for frequent medical interventions that lead to a change in medications and/or required hospitalization, surgery or an invasive procedure or emergency department/urgent care visit, as determined by the Site PI.
  • Note 2: Any chronic disease, that has been diagnosed within 90 days of screening is excluded.
  • History of any psychiatric condition that has required hospitalization in the last 12 months or subject is considered psychologically unstable by the investigator.
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  • History of any clinically significant (CS) disease or disorder, medical/surgical procedure, or trauma within 4 weeks prior to initiation of administration of study product(s).
  • History of Clostridium difficile induced diarrhea within 1 year before screening
  • Known history of past or current epilepsy or seizure disorders, excluding febrile seizures of childhood.
  • Prior exposure to Zidebactam (ZID).
  • Use of any prohibited prescription or non-prescription medication within 14 days prior to the first dose of study drug(s) as described in Section 6.6
  • Use of any investigational drug product within 30 days or 5 half-lives (whichever is longer) before investigational product administration in this study.
  • Planned participation in a clinical research study that requires treatment with a study drug, blood draws or other invasive assessments during the study period (screening until final visit).
  • Blood or plasma donation of 500 mL within 3 months or more than 100 mL within 30 days before signing informed consent or planned donation prior to completion of this trial.
  • Positive serum pregnancy test for women at screening and urine pregnancy test at check-in.
  • Positive urine alcohol test or urine drug screen test at screening or check-in (Day -1).
  • Positive test for HIV antibodies, hepatitis B-virus surface antigen (HBsAg), or anti-hepatitis C-virus antibodies (anti-HCV) at screening.
  • History of > / = 10 pack-years smoking in the 5-year period before screening, or positive urine cotinine screen at check-in.
  • Note 1: Nicotine products include cigarettes, e-cigarettes, pipe, cigar, chewing tobacco, nicotine patch.
  • Note 2: Positive urine cotinine at screening is allowed if negative at check-in (Day -1).
  • History of binge drinking or heavy drinking of alcohol at any time in the 6 months before study product administration.
  • Note 1: Binge drinking is defined as 5 or more drinks during single occasion if male, or 4 or more if female.
  • Note 2: Heavy drinking of alcohol is defined as consumption of more than 15 units of alcohol per week if male, or more than 8 units if female.

Trial locations and contacts

1 site in 1 country.

United States1 site

  • Altasciences Inc - Kansas City

    Overland Park, Kansas, 66212

Other trials in United States

About this study

Official title: A Phase 1, Randomized, Double-Blind, Placebo-Controlled, Dose-Escalation Study to Evaluate the Safety, Tolerability, and Pharmacokinetics of Intravenous Ertapenem in Combination With Zidebactam (WCK 6777) In Healthy Adult Subjects

This is a Phase 1, single center study to investigate the safety, tolerability, and pharmacokinetics (PK) of three dose-level groups of WCK 6777 (ERT and ZID combination), and two dose-level groups of ERT alone and ZID (WCK 5107) alone in 52 healthy adult male and female subjects aged 18 to 45 years old (both inclusive). Seven treatment cohorts will be evaluated in this study. WCK 6777 will be evaluated in three cohorts - Cohorts 1, 4 and 7- of 8 subjects each (6 study drug combinations and 2 placebos); ERT will be evaluated alone in two cohorts - Cohorts 2 and 5- of 8 subject each (6 ERT and 2 placebos); and ZID will be evaluated in two cohorts, Cohorts 3 and 6, of 6 subjects each (all ZID). The study will be placebo-controlled and double-blinded in all cohorts except Cohorts 3 and 6. No placebo subjects are included in standalone ZID cohorts, since adequate safety data for higher doses of ZID alone in comparison with placebo are available from completed Phase 1 studies of WCK 5107 (ZID) alone and the ZID-only arms of WCK 5222 (cefepime + ZID) studies. The primary objective is to assess the safety and tolerability of three dose-escalating regimens of WCK 6777 ( ERT and ZID combination) and two-dose escalating regimens of standalone ERT or ZID following single daily doses for 7 days in healthy adult subjects.

Read the detailed description

This is a Phase 1, single center study to investigate the safety, tolerability, and pharmacokinetics (PK) of three dose-level groups of WCK 6777 (ERT and ZID combination), and two dose-level groups of ERT alone and ZID (WCK 5107) alone in 52 healthy adult male and female subjects aged 18 to 45 years old (both inclusive). Seven treatment cohorts will be evaluated in this study. WCK 6777 will be evaluated in three cohorts - Cohorts 1, 4 and 7- of 8 subjects each (6 study drug combinations and 2 placebos); ERT will be evaluated alone in two cohorts - Cohorts 2 and 5- of 8 subject each (6 ERT and 2 placebos); and ZID will be evaluated in two cohorts, Cohorts 3 and 6, of 6 subjects each (all ZID). The study will be placebo-controlled and double-blinded in all cohorts except Cohorts 3 and 6. No placebo subjects are included in standalone ZID cohorts, since adequate safety data for higher doses of ZID alone in comparison with placebo are available from completed Phase 1 studies of WCK 5107 (ZID) alone and the ZID-only arms of WCK 5222 (cefepime + ZID) studies. In each cohort, either study drugs alone or their combination will be administered by a single intravenous infusion (IV) of 100 mL daily for 7 consecutive days in Cohort 1 or 250 mL daily for 7 consecutive days in Cohorts 2 to 7. For each treatment cohort, however, the dose will be progressively escalated from 1 g/daily to 2 g/daily and to 3 g/daily, and the duration of infusion time increased from 30 min to 1 h and to 2 h over the course of the study. In Cohort 1, WCK 6777 2 g (ERT 1 g/daily combined with ZID 1 g/daily) will be administered in 30 (±5) minutes (min); in Cohort 2 (ERT 2 g/daily), Cohort 3 (ZID 2 g/daily), and Cohort 4 (WCK 6777 4 g [ERT 2 g/daily combined with ZID 2 g/daily]) the study drug(s) will be administered in 60 (±10) min, and in Cohort 5 (ERT 3 g/daily), Cohort 6 (ZID 3 g daily) and Cohort 7 (WCK 6777 6 g [ERT 3 g/daily combined with ZID 3 g/daily]), the study drug(s) will be administered in 120 (±10) min. The primary objective is to assess the safety and tolerability of three dose-escalating regimens of WCK 6777 ( ERT and ZID combination) and two-dose escalating regimens of standalone ERT or ZID following single daily doses for 7 days in healthy adult subjects. The secondary objective is to characterize the PK profiles in plasma (total \& free) and in urine of three dose-escalating regimens of WCK 6777 (ERT and ZID combination) and two dose-escalating regimens of standalone ERT or ZID following a single initial dose on Day 1 and after single daily doses for 7 days in healthy adult subjects.

Being tested
Ertapenem, Placebo, WCK 6777, Zidebactam
Keywords
Double-blind, Intravenous Ertapenem, Phase 1, Safety, Zidebactam (WCK 6777)
Medical subject headings
Bacterial Infections

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • ErtapenemDrug

    A 1-beta methyl-carbapenem that is structurally related to beta-lactam antibiotics

  • PlaceboOther

    Placebo

  • WCK 6777Drug

    A combination of ertapenem (ERT) and zidebactam (ZID)

  • ZidebactamDrug

    A betaß-lactamase inhibitor and betaß-lactam enhancer from the diazabicyclooctane (DBO) class

Study groups in NCT05645757
Study groupRoleWhat they receive
Cohort 1ExperimentalWCK 6777 (Ertapenem 1 g combined with Zidebactam 1 g) or placebo administered by 100 ml of intravenous infusion (IV) for 30 (±5) minutes once daily for 7 days. N= 8
Receives: Drug: Ertapenem; Other: Placebo; Drug: WCK 6777; Drug: Zidebactam
Cohort 2ExperimentalErtapenem 2 g or placebo administered by 250 ml of intravenous infusion (IV) for 1 hour once daily for 7 days. N=8
Receives: Drug: Ertapenem; Other: Placebo
Cohort 3ExperimentalZidebactam 2 g administered by 250 ml of intravenous infusion (IV) for 1 hour,once daily,for 7 days. N=6
Receives: Drug: Zidebactam
Cohort 4ExperimentalWCK 6777 (Ertapenem 2 g combined with Zidebactam 2 g) or placebo administered by 250 ml of intravenous infusion (IV) for 1 hour, once daily, for 7 days. N=8
Receives: Drug: Ertapenem; Other: Placebo; Drug: WCK 6777; Drug: Zidebactam
Cohort 5ExperimentalErtapenem 3 g or placebo administered by 250 ml of intravenous infusion (IV) for 2 hours, once daily, for 7 days. N=8
Receives: Drug: Ertapenem; Other: Placebo
Cohort 6ExperimentalZidebactam 3 g administered by 250 ml of intravenous infusion (IV) for 2 hours, once daily, for 7 days. N=6
Receives: Drug: Zidebactam
Cohort 7ExperimentalWCK 6777 (Ertapenem 3 g combined with Zidebactam 3 g) or placebo administered by 250 ml of intravenous infusion (IV) for 2 hours, once daily, for 7 days. N=8
Receives: Drug: Ertapenem; Other: Placebo; Drug: WCK 6777; Drug: Zidebactam

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Number of Participants With Treatment-Emergent Adverse Events

    Adverse events (AEs) are defined as any untoward medical occurrence in a participant or clinical investigation participant who was administered a pharmaceutical product, regardless of its causal relationship to the product. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with use of the product, and are described as treatment-emergent AEs (TEAEs). Number of participants with a TEAE are summarized by dose group and by MedDRA System Organ Class (SOC).

    Measured: Day 1 through Day 11

  2. Number of Treatment-Emergent Adverse Events Reported

    Adverse events (AEs) are defined as any untoward medical occurrence in a participant or clinical investigation participant who was administered a pharmaceutical product, regardless of its causal relationship to the product. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with use of the product, and are described as treatment-emergent AEs (TEAEs). Number of TEAEs reported are summarized by dose group and MedDRA System Organ Class (SOC)..

    Measured: Day 1 through Day 11

  3. Number of Participants With Treatment-Emergent Adverse Events Related to Study Product

    Adverse events (AEs) are defined as any untoward medical occurrence in a participant or clinical investigation participant who was administered a pharmaceutical product, regardless of its causal relationship to the product. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with use of the product, and are described as treatment-emergent AEs (TEAEs). TEAEs are assessed by the investigator to determine relationship to the study drug. Number of participants with a related TEAE are summarized by dose group and by MedDRA System Organ Class (SOC).

    Measured: Day 1 through Day 11

  4. Number of Serious Adverse Events Reported

    Serious AEs (SAEs) meet one or more of the following criteria: death, life-threatening AEs, inpatient hospitalization or prolongation of existing hospitalization, persistent or significant disability or incapacity, substantial disruption of the ability to conduct normal life function, congenital anomaly/birth defect, or important medical events that may jeopardize the participant and may require medical or surgical intervention to prevent one of the outcomes listed in this definition. SAEs are listed.

    Measured: Day 1 through Day 11

  5. Number of Participants With Abnormal Chemistry Laboratory Toxicity Results

    Parameters and thresholds include alanine aminotransferase =33 (female (F) 19Y), =30 (F >19) or =47 U/L (male (M) =19Y); albumin =3.5 g/dL; alkaline phosphatase =129 (F 19Y), =126 (F =49Y), =170 (M 19Y) or =131 U/L (M =49Y); aspartate aminotransferase =33 (19Y) or =41 U/L (20-49Y); bilirubin =1.2 (19Y) or =1.3 mg/dL (>19Y); calcium =8.8 (4-19Y), =8.5 (20-49Y), =10.5 (4-19Y), =10.3 (F 20-49Y) or =10.4 mg/dL (M 20-49Y); carbon dioxide =19 or =33 mmol/L; creatinine =0.97 (F 18-29Y), =0.98 (F 30-39Y), =1.00 (F 40-49Y), =1.25 (M 18-29Y), =1.27 (M 30-39Y) or =1.30 mg/dL (M 40-49Y); direct bilirubin =0.3 mg/dL; glucose =64 or =100 mg/dL; potassium =3.7 (19Y), =3.4 (>19Y), = 5.2 (19Y) or = 5.4 mmol/L (>19Y); protein =6.2 (19Y) or =6.0 g/dL (>19Y); sodium =134 or =147 mmol/L; and urea nitrogen =21 (19Y) or =26 mg/dL (>19Y). All abnormal toxicity results are included, but Grade 1 values at screening/baseline allowed for enrollment were only considered TEAEs if they increased in severity.

    Measured: Day 1 through Day 11

  6. Number of Participants With Abnormal Hematology Laboratory Toxicity Results

    Parameters and thresholds include basophils =201 x106/L (>6Y); eosinophils =501 x106/L (>6Y); hemoglobin =11.4 (female (F) 18Y), =11.6 (F >18Y), =11.9 (male (M) 18Y) or =13.1 g/dL (M >18Y); leukocytes =4.4 (18Y), =3.7 (>18Y), =13.1 (18Y) or =10.9 x109/L (>18Y); lymphocytes =1199 (18Y) or =849 x106/L (>18Y); monocytes =901 (18Y) or =951 x106/L (>18Y); neutrophils =1799 (18Y) or =1499 x106/L (>18Y); and platelets <140 x109/L. All abnormal toxicity results are included, but Grade 1 values at screening/baseline allowed for enrollment were only considered TEAEs if they increased in severity.

    Measured: Day 1 through Day 11

  7. Number of Participants With Abnormal Coagulation Laboratory Toxicity Results

    Parameters and thresholds include activated partial thromboplastin time >32 s, prothrombin intl. normalized ratio >1.1 (ratio), and prothrombin time >11.5 s. All abnormal toxicity results are included, but Grade 1 values at screening/baseline allowed for enrollment were only considered TEAEs if they increased in severity.

    Measured: Day 1 through Day 11

  8. Number of Participants With Abnormal Urinalysis Laboratory Toxicity Results

    Parameters and thresholds include dipstick measurements of glucose =1+, leukocyte esterase =1+, occult blood =1+, protein =1+ and urinalysis with microscopy results of at least a few bacteria, red blood cells (RBC) =3 per high-powered field (HPF), and white blood cells (WBC) =6 per HPF. If dipstick results were abnormal, urinalysis with microscopy was performed. All abnormal toxicity results are included, but Grade 1 values at screening/baseline allowed for enrollment were only considered TEAEs if they increased in severity.

    Measured: Day 1 through Day 11

  9. Number of Participants With Abnormal Electrocardiogram (ECG) Toxicity Results

    The only ECG parameters graded were PR interval with a threshold of =211 msec and QTcF interval with a threshold of =471 msec (female) or =451 msec (male) or an increase of =30 msec above baseline. ECG values after dosing were considered as TEAEs if they met toxicity grading criteria.

    Measured: Day 8 and Day 11

  10. Number of Participants With Abnormal Vital Signs (VS)

    VS parameters and thresholds include diastolic blood pressure =90 mmHg, oral temperature =37.3 °C, pulse =49 or =101 beats/min, respiratory rate =21 breaths/min, and systolic blood pressure =88 or =131 mmHg. VS could be repeated up to twice more at rest and within at least 5 minutes of each other. The following rules were used to determine which vital sign measurement to use for analysis if repeat measurements occurred: 1. If the first replicate was normal, it was used. 2. If the first and second replicates were both abnormal, the replicate with the higher severity was used. 3. If the first replicate was abnormal, the second replicate was normal, and the third replicate was not performed, the first replicate was used. 4. If the first replicate was abnormal and the second and third replicates were normal, the second replicate was used. 5. If the first and third replicates were abnormal and the second replicate was normal, the abnormal replicate with the higher severity was used.

    Measured: Day 1 through Day 11

Secondary outcomes (42)

  1. Maximum Observed Concentration (Cmax) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the Cmax (µg/mL) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group.

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  2. Minimum Observed Concentration (Cmin) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the Cmin (µg/mL) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group.

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  3. Predicted Concentration at the End of the Dosing Interval (Ctau) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the Ctau (µg/mL) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group. Ctau is estimated using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration).

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  4. Dose-Normalized Maximum Observed Concentration (Cmax/Dose) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the dose-normalized Cmax ((µg/mL)/mg) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  5. Time of Maximum Concentration (Tmax) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Median and minimum/maximum of the Tmax (h) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group.

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  6. Time of Minimum Concentration (Tmin) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Median and minimum/maximum of the Tmin (h) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group.

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  7. Area Under the Concentration-Time Curve From Dosing to the Predicted Time the Concentration Reaches the Lower Limit of Quantification (AUC(0-t)) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the total area under the concentration-time curve from dosing (time 0 h) extrapolated to the time the concentration is predicted to reach the lower limit of quantification (LLOQ), AUC(0-t) (µg*h/mL), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration).

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  8. Area Under the Concentration-Time Curve From Dosing to Time of the Last Measured Concentration (AUC(0-last)) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the total area under the concentration-time curve from dosing (time 0 h) to the time of last measured concentration, AUC(0-last) (µg*h/mL),parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group.

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  9. Area Under the Concentration-Time Curve From Dosing Taken to the Limit as the End Time Becomes Arbitrarily Large (AUC(0-inf)) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the total area under the concentration-time curve from dosing (time 0 h) taken to the limit as the end time becomes arbitrarily large, AUC(0-inf) (µg*h/mL), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration).

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  10. Area Under the Concentration-Time Curve From Dosing Extrapolated to 24 Hours After Dosing (AUC(0-24)) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the total area under the concentration-time curve from dosing (time 0 h) extrapolated to 24 h after dosing, AUC(0-24) (µg*h/mL), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration).

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  11. Area Under the Concentration-Time Curve From Dosing to the End of the Dosing Interval (AUC(0-tau)) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the total area under the concentration-time curve from dosing (time 0 h) to the end of the dosing interval (24 h post-infusion), AUC(0-tau) (µg*h/mL), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  12. Dose-Normalized Area Under the Concentration-Time Curve From Dosing to the End of the Dosing Interval (AUC(0-tau)/Dose) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the dose-normalized total area under the concentration-time curve from dosing (time 0 h) to the end of the dosing interval (24 h post-infusion), AUC(0-tau)/Dose ((µg*h/mL)/mg), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration).

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  13. Terminal Elimination Half-Life (t1/2) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the terminal elimination half-life, t1/2 (h), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration).

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  14. Total Clearance (CLT) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the total clearance, CLT (L/h), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration).

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  15. First-Order Terminal Phase Elimination Rate Constant (Ke) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the first-order terminal phase elimination rate constant, Ke (1/h), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration).

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  16. Apparent Volume of Distribution (Vd) for Dose 1 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the apparent volume of distribution, Vd (L), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 1 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration).

    Measured: =0.5 h prior to dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) infusion

  17. Maximum Observed Concentration at Steady State (Cmax,ss) of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the Cmax,ss (µg/mL) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group. These estimates assume steady state has been achieved.

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  18. Minimum Observed Concentration at Steady State (Cmin,ss) of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the Cmin,ss (µg/mL) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group. These estimates assume steady state has been achieved.

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  19. Dose-Normalized Maximum Observed Concentration at Steady State (Cmax,ss/Dose) of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the dose-normalized Cmax,ss ((µg/mL)/mg) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group. This estimate assumes steady state has been achieved.

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  20. Average Concentration Over the Dose 7 Dosing Interval (Cavg) of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the average concentration over the Dose 7 dosing interval, Cavg (µg/mL) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration). Cavg is calculated as AUC(0-tau,ss)/tau. These estimates assume steady state has been achieved.

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  21. Predicted Concentration at the End of the Dosing Interval at Steady State (Ctau,ss) of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the predicted concentration at the end of the dosing interval at steady state, Ctau,ss (µg/mL), parameters estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration). These estimates assume steady state has been achieved.

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  22. Time of Maximum Concentration at Steady State (Tmax,ss) for Dose 7 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Median and minimum/maximum of the Tmax,ss (h) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group. The estimate for Tmax,ss assumes steady state has been achieved.

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  23. Time of Minimum Concentration (Tmin) for Dose 7 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Median and minimum/maximum of the Tmin (h) parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group.

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  24. Area Under the Concentration-Time Curve From Dose 7 Dosing Extrapolated to 24 Hours After Dosing at Steady State (AUC(0-24),ss) of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the area under the concentration-time curve from dosing (time 0 h) extrapolated to 24 h after dosing at steady state, AUC(0-24),ss (µg*h/mL), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration). This estimate assumes steady state has been achieved.

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  25. Area Under the Concentration-Time Curve From Dose 7 Dosing to the End of the Dosing Interval at Steady State (AUC(0-tau),ss) of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the area under the concentration-time curve from dosing (time 0 h) to the end of the dosing interval (24 h post-infusion) at steady state, AUC(0-tau),ss (µg*h/mL), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration). This estimate assumes steady state has been achieved.

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  26. Dose-Normalized Area Under the Concentration-Time Curve From Dose 7 Dosing to the End of the Dosing Interval at Steady State (AUC(0-tau),ss/Dose) of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the dose-normalized total area under the concentration-time curve from dosing (time 0 h) to the end of the dosing interval (24 h post-infusion) at steady state, AUC(0-tau),ss/Dose ((µg*h/mL)/mg), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration). This estimate assumes steady state has been achieved.

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  27. Terminal Elimination Half-Life (t1/2) for Dose 7 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the terminal elimination half-life, t1/2 (h), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration).

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  28. Total Clearance (CLT) for Dose 7 of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the total clearance, CLT (L/h), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration).

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  29. Apparent Volume of Distribution at Steady State (Vd,ss) of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the apparent volume of distribution at steady state, Vd,ss (L), parameter estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h period following Dose 7 by dose group using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration). This estimate assumes steady state has been achieved.

    Measured: =0.5 h prior to the start of Dose 7 (Day 7) dosing and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 7 infusion

  30. Linearity Index of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the linearity index (ratio) for the total ERT, free ERT, total ZID, and free ZID plasma concentration-time data by dose group. The linearity index is a measure of how linear the relationship is between increase in administered dose and increase in exposure. The linearity index is estimated as AUC(0-tau),ss (Dose 7)/AUC(0-inf) (Dose 1), where the areas under the concentration-time curves from Dose 7 to the end of the dosing interval at steady state and from Dose 1 taken to the limit as the end time becomes arbitrarily large, AUC(0-tau),ss and AUC(0-inf) respectively, are calculated using Phoenix WinNonlin Non-compartmental Analysis with Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration). The AUC(0-tau),ss estimate assumes steady state was reached.

    Measured: =0.5 h prior to the start of and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) and Dose 7 (Day 7) infusions

  31. The Accumulation Ratio of the Area Under the Concentration-Time Curve (RAUC) of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the accumulation ratio of the AUC, RAUC (ratio), parameter for the total ERT, free ERT, total ZID, and free ZID plasma concentration-time data by dose group. RAUC is estimated as AUC(0-tau),ss (Dose 7)/AUC(0-24) (Dose 1), where the areas under the concentration-time curves from Dose 7 to the end of the dosing interval at steady state and from Dose 1 extrapolated to 24 h after Dose 1, AUC(0-tau),ss and AUC(0-24) respectively, are calculated using Phoenix WinNonlin Non-compartmental Analysis with the Ke (first-order terminal phase elimination rate constant) acceptance criteria: Rsq_adjusted (adjusted R-squared) = 0.90 and includes at least 3 timepoints after Tmax (time of maximum concentration). The AUC(0-tau),ss estimate assumes steady state was reached.

    Measured: =0.5 h prior to the start of and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) and Dose 7 (Day 7) infusions

  32. The Accumulation Ratio of the Maximum Observed Concentration (RCmax) of Total ERT, Free ERT, Total ZID, and Free ZID in Plasma

    Geometric mean (GM), and coefficient of variation percentage (CV%) of the accumulation ratio of the Cmax, RCmax (ratio), parameter for the total ERT, free ERT, total ZID, and free ZID plasma concentration-time data by dose group. RCmax is estimated as Cmax (Dose 7)/Cmax (Dose 1), where the Cmax parameters are estimated from the total ERT, free ERT, total ZID, or free ZID plasma concentration-time data over the 24-h periods following Dose 1 and Dose 7, respectively.

    Measured: =0.5 h prior to the start of and 0.25 h (WCK 6777 2g group only), 0.5 h (WCK 6777 2g, ERT 2g, ZID 2g, and WCK 6777 4g groups only), 1 h, 2 h, 3 h, 4 h, 8 h, 12 h, 18 h, and 24 h post-start of Dose 1 (Day 1) and Dose 7 (Day 7) infusions

  33. Amounts of Unchanged ERT and Unchanged ZID Excreted in Urine (Ae,Urine) During Each Nominal Time Collection Interval Following Dose 1

    Mean and minimum/maximum of the amount of unchanged ERT and the amount of unchanged ZID excreted in urine, Ae,urine (mg), during 0-4 h, 4-8 h, 8-12 h, and 12-24 h following Dose 1 by dose group. Ae,urine parameters are calculated using a combination of Phoenix WinNonlin and SAS version 9.4 or above.

    Measured: 0-4 h, 4-8 h, 8-12 h, and 12-24 h post-start of Dose 1 (Day 1) infusion

  34. Cumulative Amounts of Unchanged ERT and Unchanged ZID Excreted in Urine From Zero (Predose) to 24 h Following Dose 1 (Ae,Urine(0-24))

    Mean and minimum/maximum of the cumulative amount of unchanged ERT and the cumulative amount of unchanged ZID excreted in urine from zero (predose) to 24 h following Dose 1, Ae,urine(0-24) (mg), by dose group. This parameter is calculated using a combination of Phoenix WinNonlin and SAS version 9.4 or above.

    Measured: 0-1 h pre-start of Dose 1 (Day 1) infusion and 0-4 h, 4-8 h, 8-12 h, and 12-24 h post-start of Dose 1 infusion

  35. Fractions (%) of ERT and ZID Excreted Unchanged in Urine (fe,Urine) During Each Nominal Time Collection Interval Following Dose 1

    Mean and minimum/maximum of the fraction of ERT and the fraction of ZID excreted unchanged in urine, fe,urine (%), during 0-4 h, 4-8 h, 8-12 h, and 12-24 h following Dose 1 by dose group. These fe,urine parameters are calculated using a combination of Phoenix WinNonlin and SAS version 9.4 or above.

    Measured: 0-4 h, 4-8 h, 8-12 h, and 12-24 h post-start of Dose 1 (Day 1) infusion

  36. Fractions (%) of ERT and ZID Excreted Unchanged in Urine From Zero (Predose) to 24 h Following Dose 1 (fe,Urine(0-24))

    Mean and minimum/maximum of the fraction of ERT and the fraction of ZID excreted unchanged in urine from zero (predose) to 24 h following Dose 1, fe,urine(0-24) (%), by dose group. This parameter is calculated using a combination of Phoenix WinNonlin and SAS version 9.4 or above.

    Measured: 0-1 h pre-start of Dose 1 (Day 1) infusion and 0-4 h, 4-8 h, 8-12 h, and 12-24 h post-start of Dose 1 infusion

  37. Renal Clearance of ERT and ZID From Dosing Until the Last Collected Concentration for Dose 1 (CLR(0-24))

    Geometric mean (GM), and coefficient of variation percentage (CV%) of renal clearance of ERT and ZID from dosing until the last collected concentration for Dose 1 (24 h postdose), CLR(0-24) (mL/h ), by dose group. This parameter is calculated using a combination of Phoenix WinNonlin and SAS version 9.4 or above.

    Measured: 0-1 h pre-start of Dose 1 (Day 1) infusion and 0-4 h, 4-8 h, 8-12 h, and 12-24 h post-start of Dose 1 infusion

  38. Amounts of Unchanged ERT and Unchanged ZID Excreted in Urine (Ae,Urine) During Each Nominal Time Collection Interval Following Dose 7

    Mean and minimum/maximum of the amount of unchanged ERT and the amount of unchanged ZID excreted in urine, Ae,urine (mg), during 0-4 h, 4-8 h, 8-12 h, and 12-24 h following Dose 7 by dose group. Ae,urine parameters are calculated using a combination of Phoenix WinNonlin and SAS version 9.4 or above.

    Measured: 0-4 h, 4-8 h, 8-12 h, and 12-24 h post-start of Dose 7 (Day 7) infusion

  39. Cumulative Amounts of Unchanged ERT and Unchanged ZID Excreted in Urine From Zero (Predose) to 24 h Following Dose 7 (Ae,Urine(0-24),SS)

    Mean and minimum/maximum of the cumulative amount of unchanged ERT and the cumulative amount of unchanged ZID excreted in urine from zero (predose) to 24 h following Dose 7, Ae,urine(0-24) (mg), by dose group. This parameter is calculated using a combination of Phoenix WinNonlin and SAS version 9.4 or above.

    Measured: 0-1 h pre-start of Dose 7 (Day 7) infusion and 0-4 h, 4-8 h, 8-12 h, and 12-24 h post-start of Dose 7 infusion

  40. Fractions (%) of ERT and ZID Excreted Unchanged in Urine (fe,Urine) During Each Nominal Time Collection Interval Following Dose 7

    Mean and minimum/maximum of the fraction of ERT and the fraction of ZID excreted unchanged in urine, fe,urine (%), during 0-4 h, 4-8 h, 8-12 h, and 12-24 h following Dose 7 by dose group. These fe,urine parameters are calculated using a combination of Phoenix WinNonlin and SAS version 9.4 or above.

    Measured: 0-4 h, 4-8 h, 8-12 h, and 12-24 h post-start of Dose 7 (Day 7) infusion

  41. Fractions (%) of ERT and ZID Excreted Unchanged in Urine From Zero (Predose) to 24 h Following Dose 7 (fe,Urine(0-24),SS)

    Mean and minimum/maximum of the fraction of ERT and the fraction of ZID excreted unchanged in urine from zero (predose) to 24 h following Dose 7, fe,urine(0-24) (%), by dose group. This parameter is calculated using a combination of Phoenix WinNonlin and SAS version 9.4 or above.

    Measured: 0-1 h pre-start of Dose 7 (Day 7) infusion and 0-4 h, 4-8 h, 8-12 h, and 12-24 h post-start of Dose 7 infusion

  42. Renal Clearance of ERT and ZID From Dosing Until the Last Collected Concentration for Dose 7 (CLR(0-24),SS)

    Geometric mean (GM), and coefficient of variation percentage (CV%) of renal clearance of ERT and ZID from dosing until the last collected concentration for Dose 7 (24 h postdose), CLR(0-24) (mL/h), by dose group. This parameter is calculated using a combination of Phoenix WinNonlin and SAS version 9.4 or above.

    Measured: 0-1 h pre-start of Dose 7 (Day 7) infusion and 0-4 h, 4-8 h, 8-12 h, and 12-24 h post-start of Dose 7 infusion

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted9 Dec 2022
  2. Study start19 Apr 2023
  3. Primary completion3 Nov 2023
  4. Study completion3 Nov 2023

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Factorial
Masking
Triple blind
Who is masked
Participant, Investigator, Outcomes assessor
Enrolment
54 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05645757
Sponsor's protocol ID
21-0013
Status last verified
22 Sep 2022
First submitted
1 Dec 2022
Last updated
20 Jan 2025
FDA-regulated drug
Yes
FDA-regulated device
No

Publications

  • Lodise TP, Chavan R, Patel A, Yeole R, Bhagwat S, Patel M, Saviolakis GA, Kankam M, Gu K, Ghazaryan V, Jaunarajs A, Fairfax SR, Howell H, Bonomo RA. A Phase I, randomized, double-blind, placebo-controlled, dose escalation study to evaluate the safety, tolerability, and pharmacokinetics of intravenous ertapenem and zidebactam in combination (WCK 6777) in healthy adult subjects. Antimicrob Agents Chemother. 2026 Sep 29:e0039026. doi: 10.1128/aac.00390-26. Online ahead of print.

    PubMed 42809435

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing Ertapenem, WCK 6777 and Zidebactam in people with Bacterial Infection, run by National Institute of Allergy and Infectious Diseases (NIAID) at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 17 inclusion and 23 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 20 Jan 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 5 Dec 2024). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of Participants With Treatment-Emergent Adverse Events (time frame: Day 1 through Day 11). The study lists 10 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05645757, which also lists 1 linked publication.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 20 Jan 2025.

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